Reducing-pressure valve



(No Model.)

B. J. WOOD. REDUCING PRESSURE VALVE.

No. 489,515. Patented Jan; 10 1893.

e 2 0 a/ E f Wneats e0 UNITED STATES.

PATENT OFFICE.

EDGAR J. WOOD, OF BROOKLYN, NEW YORK.

REDUClNG-PRESSU RE VALVE.

$PEOIFICATION forming part of Letters Patent No. 489,515, dated January 10, 1893.

Application filed June 14, 1892. Serial No. 436,654. (No model.)

To all whom it may concern:

Be it known that I, EDGAR J. WOOD, of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Reducing-Pressure Valves, of which the following is a specification.

My invention relates to an improvement in reducing pressure valves in which the increase of pressure on the low pressure side of the valve beyond a predetermined degree 0perates a cut off, producing a tendency to equalize the pressure upon the opposite sides of the main valve and thereby permits the valve to approach its seat and reduce the pressure on the low pressure side.

A practical embodiment of my invention is represented in the accompanying drawings in which,

Figure 1 represents the valve in longitudinal section, and Fig. 2 represents a top plan view.

A represents a coupling section provided with a diaphragm it across its interior, dividing it into the high pressure chamber B and thelow pressure chamber B. The diaphragm a has an opening therein around the margin of which is a valve seat a.

The valve 0 is of the piston type and is preferably formed hollow, its end toward the seat being open and its opposite end closed by a head 0. The valve 0 is arranged to slide up and down within a socket piece or barrel D tapped into an opening 01, in the side of the coupling section A opposite the valve seat a. The valve O is held normally toward its seat either by gravity or by a spring dbetween its head and the top of the barrel D, or by both, according to the position which-the coupling section A may occupy. A small opening 0 through the head of the valve 0 permits a gradual escape of the fluid from the high pressure side of the valve to the opposite side of the valve.

A piston valve E is seated within a barrel or casing F tapped into the side of the coupling section A. The piston valve E is provided with a port e which normally communicates at one end with the low pressure chamber B and at its opposite end with a passage way G leading to the interior of the barrel D at the back or low pressure side of the valve 0. The piston valve E is limited in its .movement toward the low pressure chamber B by a shoulderf or other suitable stop on the casing F and is under tension tending to hold it in contact with said stop f, either by its own weight or by a spring Hor by both, according to the position which the coupling section may occupy. The spring H is engaged at one end with the back of the valve E and at its opposite end with the inner end of a screw threaded plug I, which latter is engaged with the interior thread formed in the hollow stem f of the casing F. By screwing the plug Iin or out and hence increasing or diminishing the tension of the spring H, the pressure upon the piston valve E may be increased or diminished, as may be desired.

In operation, the fluid under pressure having been admitted to the high pressure chamber B, will lift the valve O and pass through into the low pressure chamber Band thence to the point where it is to do its work. So long as the pressure in the low pressure chamber B remains at a degree equal to or lower than the predetermined limit, the piston valve E will remain seated against the stop f and such of the fluid as may escape through the small opening 0 in the head of the valve 0 will pass through the passage way G and port 6 into the low pressure chamber B. When, however, the pressure in the low pressure chamber B rises above the predetermined degree, it will lift or press outwardly the piston valve E and will thereby cutoff the free communication between the passage way G and the port 6 and this in turn will cause the fluid escaping through the small opening 0' in the head of the valve 0 to accumulate on the opposite side of the valve 0 and thereby tend to equalize the pressure upon the opposite sides of said valve 0, which will cause the valve 0 to approach its seat under the pressure of its spring 01 or weight or both. As the valve 0 approaches its seat it cuts off or reduces the supplyof fluid to the low pressure chamber B which, as it becomes reduced,will again permit the piston valve E to slide toward the stop f thereby opening communication between the passage way G and the port e and again place the valve O under the control of the fluid in the high pressure chamber B. From the above it will be observed that the valve 0 is under the control of the piston valve E which in turn is under the control of the pressure of the fluid in the low pressure chamber B to keep the pressure therein below a predetermined degree.

It is obvious that the particular arrangement of the valves 0 and E with respect to each other and to the coupling section is a matter of no great importance so that com munication between the two be opened and cut 01f under the varying pressures Within the low pressure chamber B.

What I claim is:

In combination, a high pressure chamber, a low pressure chamber, a main valve under the control of the fluid in the high pressure chamber to open communication for the passage of the fluid, a piston valve independent of the aforesaid main valve and permanently exposed directly to the pressure of the fluid in the low pressure chamber, pressure regulating means in connection with the piston valve for determining the pressure under which it shall operate, a chamber at the back of said main valve in permanent communication with the high pressure chamber and a passage way from the said chamber at the back of the main valve through the Wall of the piston valve casing and through the piston valve itself to the low pressure chamber, substantially as set forth.

EDGAR J. WOOD. Witnesses:

FREDK. HAYNES, I. B. DECKER. 

